Many of the documents on this site are stored in Adobe Portable Document Format (PDF). To view these documents you'll need to have appropriate PDF reader software installed. Two readers are recommended, either can be freely downloaded to your computer:

Foxit PDF Reader	Foxit Reader allows you to both read and annotate PDF documents, printing out the annotated results (your annotations are not saved back to the Wynnedale site). Light, fast, clean. Download size is ~2-3MB.
Adobe Acrobat Reader	The original creator of the PDF format, Adobe has produced a free Reader which can be used to view and print PDF files. While the reader is free, it's a large download (~22MB) so be aware that it might take some time depending on the speed of your Internet connection.